Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c308741a54793fe…

MALICIOUS

PDF

74.6 KB Created: 2021-02-14 17:12:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 204a100b6a5a8342fdb74752a1b16ea3 SHA-1: e9da3c9651c320238b71f24f5e53bd398c2caa9d SHA-256: 2c308741a54793fe3e680ac3918e7bbb81e066c118c34e15a9ce594e01a9e72d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or redirection scheme. The PDF structure and embedded URLs point towards a spearphishing attachment delivery method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://leonvi.ru/aws?utm_term=static+template+tag+django PDF link annotation
    • https://vedoguru.weebly.com/uploads/1/3/1/3/131380953/820fd15.pdfIn PDF document text
    • http://gordei2d.com/where_to_buy_foam_paper_sheets5mj3y.pdfIn PDF document text
    • http://rosovutuwonemis.iblogger.org/chemical_equations_worksheet.pdfIn PDF document text
    • https://pukelubaluwo.weebly.com/uploads/1/3/4/7/134741361/e895e1.pdfIn PDF document text
    • https://kajubogoxin.weebly.com/uploads/1/3/0/9/130969430/regonixer_fikabisikize_naxotowi.pdfIn PDF document text
    • http://digitalliteracyinstitute.com/caffeine_for_pc0p4fl.pdfIn PDF document text
    • http://lidobexi.22web.org/80357804679.pdfIn PDF document text
    • https://fudegedetet.weebly.com/uploads/1/3/4/7/134733785/7d5bee740.pdfIn PDF document text
    • http://vodoroding.info/wakakekomojijumunugikufjrk.pdfIn PDF document text
    • http://yourdesk.website/terjemahan_kitab_al_bayanttbqp.pdfIn PDF document text
    • http://bujufamamaw.22web.org/blackberry_torch_9800_os_7._1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pevivudawof.epizy.com/deluwamepukakijakobaw.pdfIn PDF document text
    • http://fopajika.epizy.com/adobe_photoshop_touch_apk_for_jelly_bean.pdfIn PDF document text
    • http://galexuduxegi.epizy.com/24673471603.pdfIn PDF document text
    • http://pinakebe.rf.gd/2665917399.pdfIn PDF document text
    • http://zowujobosega.rf.gd/bitlocker_to_go_reader.pdfIn PDF document text
    • http://jefelaxe.epizy.com/toxoplasma_adalah.pdfIn PDF document text
    • http://venakato.epizy.com/73819727454.pdfIn PDF document text
    • http://tefinavi.epizy.com/crossword_quiz_answers_movies_level_4.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE350 5300 bytes
SHA-256: a2da23bc78eedf11d962c0496e258f4b1a6cda867c7b846178b9d6b00ecbafdc
font_01_sfnt_off0000f547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF547 12212 bytes
SHA-256: b8dd165536f19acad809cd1f633c3b45771b6ceac4e03ca9654792e1725d0597

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